Hot Chips 2026: SK hynix pushes hybrid bonding to HBM5 as AI memory hits 775-micron ceiling — firm extends MR-MUF through Nvidia Rubin from Latest from Tom's Hardware on 2026-08-24 17:55 (#77XB0) The problem, per SK, is that HBM cubes are capped at a total thickness of 775 microns, the standard thickness of a 300mm logic wafer.